Chapter 11: Principles of Metallurgy — Online MCQ Test
PHYSICAL SCIENCES · CLASS 10th · Telangana State Board
Practice Chapter 11: Principles of Metallurgy with a free chapter-wise online MCQ test.
This chapter covers: This chapter focuses on extracting metals from naturally occurring minerals and ores. It details concentration techniques (froth flotation magnetic separation) extraction processes....
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter 11: Principles of Metallurgy — Important Questions & Answers
What is an ore?
- A. A naturally occurring mineral from which metal can be extracted profitably
- B. Any rock found in the earth's crust
- C. A pure metal found in nature
- D. A synthetic material created in laboratories
Answer: A. A naturally occurring mineral from which metal can be extracted profitably
An ore is a naturally occurring mineral or aggregate of minerals from which metal can be extracted economically and profitably.
An ore is a naturally occurring mineral or aggregate of minerals from which metal can be extracted economically and profitably.
Which of the following is the process of removing unwanted impurities from ore?
- A. Concentration
- B. Reduction
- C. Refining
- D. Calcination
Answer: A. Concentration
Concentration is the process of removing unwanted impurities (gangue) from the ore to increase the percentage of the desired mineral.
Concentration is the process of removing unwanted impurities (gangue) from the ore to increase the percentage of the desired mineral.
During the roasting process, sulphide ores are heated in air. What is the primary purpose of this step?
- A. To reduce the ore to metal
- B. To convert sulphide ore to its corresponding oxide
- C. To increase the density of ore
- D. To remove water from the ore
Answer: B. To convert sulphide ore to its corresponding oxide
Roasting is the heating of sulphide ores in air to convert them into their corresponding oxides, which are easier to reduce to metals.
Roasting is the heating of sulphide ores in air to convert them into their corresponding oxides, which are easier to reduce to metals.
In the froth flotation process, collectors and frothers are added. Which statement correctly describes their roles?
- A. Collectors increase froth; frothers increase mineral floatation
- B. Collectors make minerals hydrophobic; frothers stabilize the froth
- C. Both are used to increase the density of minerals
- D. Collectors remove gangue; frothers remove water
Answer: B. Collectors make minerals hydrophobic; frothers stabilize the froth
In froth flotation, collectors (like xanthates) make the ore mineral hydrophobic so it floats, while frothers (like pine oil) create stable bubbles to carry the mineral.
In froth flotation, collectors (like xanthates) make the ore mineral hydrophobic so it floats, while frothers (like pine oil) create stable bubbles to carry the mineral.
Consider the extraction of aluminum from bauxite ore. Aluminum cannot be extracted by carbon reduction, but instead uses the Hall-Héroult process (electrolysis). This is because _______ .
- A. Aluminum oxide has a very low melting point
- B. Aluminum is less reactive than carbon
- C. Aluminum is more reactive than carbon and oxygen affinity is too strong for carbon to reduce it
- D. The Hall-Héroult process is cheaper than any other method
Answer: C. Aluminum is more reactive than carbon and oxygen affinity is too strong for carbon to reduce it
Aluminum is highly reactive and forms a very stable oxide; carbon cannot displace it because aluminum's affinity for oxygen is stronger than carbon's, so electrolysis of molten aluminum oxide in cryolite is necessary.
Aluminum is highly reactive and forms a very stable oxide; carbon cannot displace it because aluminum's affinity for oxygen is stronger than carbon's, so electrolysis of molten aluminum oxide in cryolite is necessary.